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A lithium ion battery and a preparation method thereof

A lithium-ion battery and lithium cobalt oxide technology, which is applied in the direction of secondary batteries, battery electrodes, battery components, etc., to achieve the effects of avoiding local heat accumulation, preventing positive and negative short circuits, and good heat resistance

Inactive Publication Date: 2019-04-05
SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no mature product with high safety performance in the industry, so a lithium-ion battery with high safety performance is urgently needed

Method used

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  • A lithium ion battery and a preparation method thereof
  • A lithium ion battery and a preparation method thereof
  • A lithium ion battery and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 96.8wt% positive electrode active material 4.4V high-voltage lithium cobaltate, 2wt% super conductive carbon black, 1.2wt% binder polyvinylidene fluoride, and use N-methylpyrrolidone as a solvent to make a slurry. Thick aluminum foil is used as a current collector, and the slurry is coated on both sides of the aluminum foil and dried; the pole piece is rolled to make a positive pole piece, and the density of both sides of the pole piece is 408mg / cm 2 . With 94.5wt% mesocarbon microsphere graphite (material appearance as image 3 Shown), 1wt% super conductive carbon black, 3.5wt% binder polyvinylidene fluoride, using N-methylpyrrolidone as a solvent to make a slurry, using 8um thick copper foil as a current collector, double the slurry The surface is coated on copper foil and dried; the pole piece is rolled to make a negative pole piece, and the density of both sides of the pole piece is 198mg / cm 2 . The PP / PE / PP three-layer base film is stacked to form a base f...

Embodiment 2

[0035] The difference between this example and Example 1 is that the positive electrode raw material components are as follows: 98wt% positive electrode active material 4.45V high voltage lithium cobaltate, 0.5wt% super conductive carbon black, 1.5wt% binder polyvinylidene fluoride , the positive electrode slurry is coated on one side of the positive electrode current collector; the negative electrode raw material components are as follows: 96wt% mesocarbon microsphere graphite, 0.5wt% super conductive carbon black, 3.5wt% binder polyvinylidene fluoride, negative electrode slurry The material is coated on the negative electrode current collector on one side; on the PP / PE / PP base film layer, the ceramic adhesive material is mixed on one side to make the battery separator.

Embodiment 3

[0037] The difference between this example and Example 1 is that the positive electrode raw material components are as follows: 90wt% positive electrode active material 4.35V high-voltage lithium cobaltate, 5wt% super conductive carbon black, 5wt% binder polyvinylidene fluoride, positive electrode The slurry is coated on one side of the positive electrode current collector; the raw material components of the negative electrode are as follows: 90wt% mesocarbon microsphere graphite, 5wt% super conductive carbon black, 5wt% binder polyvinylidene fluoride, and the negative electrode slurry is coated on both sides Covered on the negative electrode current collector; on the PP / PE / PP base film layer, the ceramic adhesive material is mixed and coated on one side to make the battery separator.

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Abstract

The invention discloses a lithium ion battery and a preparation method thereof. A positive electrode of the lithium ion battery adopts high pressure lithium cobaltate positive active materials, and anegative electrode of the lithium ion battery adopts mesophase carbon microsphere graphite as active materials. The separator is composed of a base film layer formed by sequentially stacking three base films of PP, PE and PP and ceramic materials coated on the base film layer. In the above manner, the lithium ion battery of the present invention can effectively suppress the thermal runaway of thebattery caused by 10V overcharge in 1C charging of the battery at different ambient temperatures (such as 5 DEG C, 25 DEG C and 50 DEG), preventing the battery from igniting and explosion; and at thesame time the lithium ion battery can withstand heavy impact, thermal shock, short circuit, acupuncture, extrusion and other destructive collisions without ignition and explosion, and has high safetyperformance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in all walks of life, especially soft-packed lithium-ion polymer batteries, which have been fully applied due to the diversification of size and structure, such as smart phones, tablet computers, notebook computers, handheld terminal products, smart wearable products, etc. technology field. However, with the promotion of the application field of soft-packaged lithium-ion polymer batteries and the increasing requirements for end-user experience, the safety performance requirements of soft-packaged lithium-ion polymer batteries are also getting higher and higher, especially in different environments. overcharge resistance performance. If the current soft-packed lithium-ion battery needs to meet the overcharge performance requirements of a voltage abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/525H01M2/16H01M10/0525H01M10/0587H01M50/449
CPCH01M4/38H01M4/525H01M10/0525H01M10/0587H01M50/449Y02E60/10Y02P70/50
Inventor 卢国杰蔡守珂张潘朱会方施建志韩晓辉
Owner SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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